OEM Carrier Control Transformer 75VA 200-230/460V–24V for Model TJACCYCATRANRY001A00

This OEM Carrier control transformer (part number HT01BD236) is the factory-specified replacement for the TJACCYCATRANRY001A00 system. The transformer steps down high-voltage line power (200/230/460V primary) to the 24V AC signal that powers all low-voltage control circuits — including the thermostat, contactor coil, and control board. When this transformer fails, the entire control circuit loses power: the thermostat goes blank, the system won't respond to any commands, and you may detect a burning smell or hear a faint buzz from the transformer housing. Common failure causes include short circuits in the 24V control wiring, electrical surges, and general wear over time.

• Specs: 75VA capacity | Primary: 200/230/460V multi-tap | Secondary: 24V AC | Class 2 rated | 50/60Hz compatible
• OEM vs Generic: This is a genuine Carrier OEM part engineered to exact factory tolerances for the TJACCYCATRANRY001A00. Generic transformers may carry mismatched VA ratings or inferior winding insulation, risking repeat failure or damage to connected control boards.
• Install difficulty: 3/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: multimeter (to verify 0V before touching terminals and 24V output after install), screwdrivers, wire nuts or spade terminals. Always label or photograph all wire connections before disconnecting. Check 24V control wiring for shorts before energizing the new transformer.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model TJACCYCATRANRY001A00. Also cross-references Carrier part numbers HT01BD235, HT01AX050, and HT01BZ236. Verify your unit's voltage requirements on the data plate before ordering. Have a fitment question? Our HVAC parts specialists confirm compatibility before you buy — order today and get same-day shipping.